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The genuine Goodman B9102097 liquid line cap with O-ring is the factory OEM service fitting for the Goodman WGHP4442AAD packaged heat pump. This cap seals the liquid-line service port to prevent refrigerant loss and keep moisture and contaminants out of the sealed system between service visits. A missing cap, a stripped cap, or a dried-out O-ring is a frequent source of slow refrigerant leaks, so installing the correct OEM cap with a fresh seal restores a positive, leak-tight closure.
OEM vs. Generic: Generic caps can have slightly different thread pitch or an incorrectly sized O-ring groove, which lets the seal weep over time. This OEM cap matches the original thread and includes the correct O-ring, providing a verified secondary seal against the service port valve.
Install Difficulty: Easy — a 5-minute task. Verify the service-port core is sealing first, seat the O-ring, then hand-tighten the cap and snug it about a quarter turn with a wrench. Do not over-torque, which can deform the O-ring.